The Staggered Magnetization of the Square Lattice Frustrated Heisenberg Model |
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Authors: | Shi-Min CUI |
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Institution: | Institute of Condensed Matter Physics and Department of Physics Shanghai Jiao Tong University, Shanghai 200030, China |
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Abstract: | Spin-wave expansion is used to evaluate the staggered magnetization of frustrated antiferromagnetic (AF) Heisenberg model with next-nearest-neighbor exchange couplings on a square lattice to the order O(1/S) at zero temperature. It is shown that the O(1/S) order correction increases the staggered magnetization and its presence invalidates the conventional spin- wave conclusions at large frustrations. We apply the mean-field approximation to deal with the quartic terms in the Hamiltonian of the Holstein-Primakoff transformation. A phaqe diagtam is obtained, suggesting that the NCel order is not destroyed for S≥1 at any frustration, while for S = 1/2 there may exist a disordered phase for strong frustrations. |
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